CN1016255B

CN1016255B - Balanced turbine rotor

Info

Publication number: CN1016255B
Application number: CN89100631A
Authority: CN
Inventors: 罗尔福·里克·巴伯
Original assignee: Westinghouse Electric Corp
Current assignee: CBS Corp
Priority date: 1988-02-10
Filing date: 1989-02-03
Publication date: 1992-04-15
Also published as: ES2013002A6; KR890013310A; JPH01244102A; CN1035341A; US4842485A; IT1232622B; CA1294890C; IT8941516A0

Abstract

A balanced turbine rotor has a cylindrical member with a pair of opposed end shafts and an enlarged central portion, the enlarged central portion having first and second faces, with a circular groove formed in at least one of the faces and expandable weight assemblies engageable in the groove. The weight assemblies have an arcuate body member and an expander screw, the arcuate body member formed into upper and lower deformable secetions by a bore therethrough and slots from side walls thereof to the bore, such that the expander screw forces the deformable sections apart to secure the weights at any desired location about the groove in the face of the enlarged central portion of the rotor.

Description

Balanced turbine rotor

This invention relates to a balanced type turbine rotor that adopts heavy component, and this heavy component can embed in the groove on the core end face that turbine rotor enlarged.

The effect of turbo machine is well-known, and for example steam turbine can generate electricity.This turbo machine is equipped with the rotor at center, and rotor is installed in the casing, and the one group of blade that stretches with radiation shapes is fixed on the rotor, and blade makes the rotor rotation and makes a power generating equipment running under the impact of steam.Rotor used in this turbo machine is normally made by large-scale alloy steel forging, and they are processed to definite shape, comprises a barrel portion that has enlarged, and stretches out relative concentric shafts from this cylindrical body opposing end surface.The rotor of size requires rotor to want balance before use like this, so that can efficiently move, this cylindrical body that has enlarged has end face with relative axle junction point, and this end face is as the balance of rotor.

The routine of this rotor allocate the weighing apparatus method be with the barrel portion end face of the concentric expansion of the axis of rotating shaft on open some tapped holes, threaded insert is placed in the tapped hole of selection, its result makes balancing rotor by additional threaded insert weight on the barrel portion surface diverse location that enlarges.A large amount of this tapped holes is arranged on end face usually, provide various weight change with this.These equalizing orifices of using for balanced plug are very time taking when holing with tapping.Because the rotor material investment is very high, so people wish to make the time cycle of buying rotor material and finishing between the balancing rotor can reduce to minimum.

Some existing rotors have a groove or a ditch on the end face of the barrel portion that has enlarged, for example, a kind of balanced type turbine rotor is disclosed in U.S. Pat 3736811, it comprises a cylindrical parts with a pair of opposite end axle, the core of an expansion, the core of this expansion has first and second end faces, in the above-mentioned end face coaxial, at least one end face a circular groove is arranged with holding axle, also comprise the heavy component that is embedded in the above-mentioned circular groove, above-mentioned in other words heavy component can insertion groove in and be fixed on the precalculated position of opposing end surface, each weight comprises ogive parts, and ogive has a rear wall, the limit wall, on, following arcuate walls and an antetheca, towards rear wall a tapped hole is arranged from antetheca.Weight equalizer can be fixed in the groove by means of positioning screwn.Yet this balance sysmte needs time-consuming operation with a large amount of tapped holes of tapping on the cylindrical body end face that enlarges, but the zone of weighting material also is limited on the while end face.

Main purpose of the present invention provides a kind of balanced type turbine rotor, and it need be at its end face thorax hole and tapping not forming equalizing orifice, and weight equalizer can be embedded on any angular orientation of end face reliably, thereby reduces the cycle of rotor processing.

In line with this purpose, the invention belongs to a kind of balanced type turbine rotor, it comprises a cylinder part with core of a pair of opposite end axle and an expansion, the core of this expansion has first and second end faces, and on an above-mentioned end face concentric with holding axle a circular groove is arranged at least; Also comprise the heavy component that can be embedded in the above-mentioned circular groove, thereby above-mentioned heavy component can be inserted in the above-mentioned groove and with respect to end face and is fixed on the preposition; Each above-mentioned heavy component comprises ogive parts, and these ogive parts have rear wall, Bian Bi, upper and lower arcuate walls and an antetheca.Form a tapped hole from antetheca towards rear wall, and on each limit wall, form a slit; This tapped hole is taper, and only extends to the termination of contiguous rear wall in the slit of Bian Bizhong, thereby forms two deformable upper and lower parts; Cone expansion screw to be being threadably engaged in the above-mentioned conical screw hole, so that above-mentioned upper and lower two deformable segments expand, thereby above-mentioned ogive is fixed in the above-mentioned circular groove.

Near the core end face that turbine rotor enlarges, a radially flange of inside extrusion moulding is preferably arranged, this flange extends in the groove, and the inner radial wall of ogive has a groove that is positioned at the arcuate walls edge, when the top of ogive and bottom expanded, this flange just was placed in the groove and goes.

The present invention with existing on rotor end-face boring and the method for tapping compare, shortened the rotor process-cycle.Simultaneously, because distensible heavy component can be settled in any position that needs on the groove of rotor end-face, thereby increased the balancing rotor degree, and former design limitation is in placing weight at rotor end-face thorax tapped hole.

By following description to the preferred embodiment that illustrates as an example in the accompanying drawing, the present invention will be easier to understand.

Fig. 1 is the perspective view that the present invention has the balanced type turbine rotor of expansible heavy component.

Fig. 2 is the end view of the balanced type turbine rotor represented in Fig. 1.

Fig. 3 is the exploded view of the expansible heavy component that uses in balanced type turbine rotor of the present invention.

Fig. 4 has showed manned expansion screw and has been locked in ogive parts in the balanced type turbine rotor groove by the longitudinal sectional drawing of an expansible heavy component.

Fig. 5 is the front view of the interior expansible heavy component of the end face groove of embedding balanced type turbine rotor.

Fig. 6 is another embodiment's of ogive parts of expansible heavy component a front view.

Fig. 7 is the sectional drawing along Fig. 6 VII-VII line.

In Fig. 1 and Fig. 2, a balanced type turbine rotor I comprises cylinder part 3, and parts 3 have a pair of relative end axle 5 and the core 7 of an expansion.With conventional the same, the core 7 of this expansion has first and second end faces 9 and 11 respectively.At least one end face in the above-mentioned end face 9 and 11, and two end faces preferably have a circular groove 13, and circular groove 13 should be coaxial with end axle 5.Turbine bucket b is fixed on the outer circumferential walls of core 7 of expansion as shown.

As shown in Figure 2, circular groove 13 is fully around end face 9(360 °), concentric with axle 5; The position of expansible heavy component 15 in this groove is according to the position of the needs of rotor 1 balance is determined.The groove 13 that forms on first and second end faces 9 and 11 by the following arcuate surface 17 on the core 7 that is enlarging, on arcuate surface 19 and rear surface 21 form.An arcuate surface, preferably lower surface 17, have one and radially extend near the flange 23(Fig. 4 that enlarges core 7 surfaces), these flange 23 circumferentially extendings enter in the groove 13.

Expansible heavy component 15 can insert and be engaged in the circular groove 13, and is expanded in groove 13, to guarantee to be fixed on the precalculated position with respect to end face 9 and 11.Comprise ogive parts 25 and expand screw 27 to the embodiment of expansible heavy component shown in Figure 5 by Fig. 3.Ogive parts 25 have a rear wall 29, limit wall 31, upper and lower arcuate walls 33 and antetheca 35.Tapped hole 37 29 formation from antetheca 35 towards rear wall, its screw thread is stopping from rear wall 29 1 segment distance places.Each limit wall 31 all has a slit 39, and this slit extends to rear wall 29 segment distance of being separated by from antetheca 35 and stops, and extends to tapped hole 37 from limit wall outer surface 41, forms the deformable top 43 and the deformable bottom 45 of ogive 25.One (preferably lower wall) in the lower wall of arch or the upper wall 33 has a groove 47 that extends from antetheca 35.

Expansion screw 27 has one first end face 49 and second end face 51, intermediate portion 53 have can screw in and with the screw thread of the wall of tapped hole 37 engagement.Being preferably in has a sunk part 55 on first end face 49, it can be used for embedding an instrument, and for example six side's screw head spanners make this screw turns.The intermediate portion 53 of expansion screw is taper, and the diameter of its first end face 49 is greater than the diameter of second end face 51.

Expansible heavy component 25 is being fastened on first end face 9 or second end face 11, in the time of perhaps in the circular groove 13 that on two end faces, forms, the tapped hole 37 of expansion screw 27 and ogive parts 25 is with thread engagement, do not open but deformable top 43 is expanded away from deformable bottom 45, two deformable segments 43 and 45 have a gap d (Fig. 3) under initial thread engagement state.Expansible heavy component 15 edges that comprise ogive parts 25 and expansion screw 27 are inserted on 13 li any desirable positions of relative this circular groove of circular groove with the direction of the parallel axes of axle 5, when it reaches desirable position, expansion screw 27 is further screwed in tapped hole 37, thereby with the deformable top and the deformable bottom 43 of ogive 25,45 expand, and the distance on antetheca 35 (in Fig. 5 with d ' expression) is just greater than initial distance d so between the two.

In another embodiment of ogive parts 25, as 25 in Fig. 6 and 7 ' shown in, slit 39 in the limit wall 31 ' stop in the enlarged of key cellular type design.Slit 39 ' stretch to rear wall 29 edges from antetheca 35 ends at from rear wall one segment distance place, and form an enlarged 57 in the slit.Simultaneously, be preferably in ogive parts 25 ' antetheca 35 in form a flat-bottom hole (counterbore) 59, this flat-bottom hole is non-threaded hole, and concentric with tapped hole 37.As shown in the figure, slit 39 ' can be from limit wall outer surface 41 to tapped hole 37 horizontal-extendings, or shown in Fig. 3 to 5 can be 39 arch as the slit.Ogive parts 25,25 ' rear wall 29 at the intersection of upper and lower arcuate walls 33 and rear wall 29 oblique angle 61 is arranged preferably.

This method that is used for the balanced type turbine rotor for example comprises that by being processed to form is positioned at center that rotor enlarges partly 7 end face 9 and 11 circular groove 13, and a plurality of expansible heavy components 15 are provided.Expansible heavy component 15 along with the direction insertion groove 13 of the parallel axes of axle 5, and be engaged on preposition, with balancing rotor with respect to this end face.After expansible heavy component 15 is properly oriented, make assembly 15 expansions by expanding screw 27 screw-in screws 37, the result expands and makes the weight fix in position with the deformable top 43 and the deformable bottom 45 of ogive parts 25.A small gap 63(Fig. 5 is arranged) between flange 23 and arcuate walls 47, if on groove 13, will move expansible weight 15 or it is removed, insert this slit removing expansion screw 27 available screw-drivers in back or similar blade-shaped instrument, afterburning in deformable segment each other.

In with the process in the expansible heavy component insertion groove, the effect of the sunk part 55 on the expansion screw 27 is fixing expansion screw 27 and ogive parts 25, and in the time of in the handle component insertion groove, they have begun thread engagement.After the engagement, the rotation of ogive when the corner angle of ogive parts 25 can stop expansion screw 27 to screw in.When screw 27 was further screwed in screw 37, taper thread produces a wedge power expanded deformable upper and lower part 43,45.Ogive parts 25 are subjected to the constraint of the cell wall 17,19 of groove 13 on the rotor owing to expansion, the result has a vertical power between expansible heavy component and cell wall, this vertical force has produced the frictional constraint power to expansible heavy component 15 in a circumferential direction.The orientation of circular groove has prevented moving radially of expansible heavy component, but moisture is discharged.Flange 23 expansible heavy component expanded and embedded groove 13 after, prevent moving axially of it.

Compare with the existing method in boring and tapping hole, native system has reduced the cycle of rotor processing.Simultaneously, because the position of expansible heavy component is unlimited many on the groove of rotor end-face, so the counterbalance of size criteriaization is provided.

Claims

1, a balanced type turbine rotor (1) comprises a cylindrical parts (3) with core (7) of a pair of opposite end axle (5) and an expansion; The core of this expansion has first and second end faces (9,11), at least one end face a circular groove (13) is arranged in the above-mentioned end face (9,11) coaxial with holding axle (5); Also comprise the heavy component (15) that is embedded in above-mentioned circular groove (13) lining, above-mentioned in other words heavy component (15) energy insertion groove (13) lining also is fixed on the precalculated position of opposing end surface (9,11); Each above-mentioned heavy component (15) comprises ogive parts (25), ogive (25) has a rear wall (29), limit wall (31), a upper and lower arcuate walls (33) and an antetheca (35) have a tapped hole (37) from antetheca (35) towards rear wall (29); And form a slit (39) in each limit wall (31); It is characterized in that: described tapped hole (37) is taper, and only extends to the termination of contiguous described rear wall (29) in slit described in the Bian Bi (39), thereby forms deformable upper and lower part (43,45); A cone expansion screw (27) is embedded in the above-mentioned conical screw hole (37) spirally, so that above-mentioned deformable top (43) and deformable bottom (45) expand, thereby above-mentioned ogive (25) is fixed on above-mentioned circular groove (13) lining.

2, as a balanced type turbine rotor (1) that limits in claim 1, it is characterized in that: the diameter that described tapped hole (37) is located at the antetheca (35) of above-mentioned ogive is greater than the diameter of its termination; Above-mentioned screw (27) has first end face (49), and a sunk part (55) is arranged on it, and it is suitable for embedding wherein with an instrument; And have second end face (51), its diameter is less than the diameter of above-mentioned first end face (49).

3, as the balanced type turbine rotor (1) defined in claim 1, it is characterized in that: described slit (39) locate the enlarged (57) of its termination of vicinity at above-mentioned rear wall (29).

4, as the balanced type turbine rotor (1) defined in the claim 1, it is characterized in that; A flange that extends radially inwardly (23) is provided, and it is adjacent with above-mentioned end face (9,11), and flange (23) is radially extending into above-mentioned groove (13) lining; The lower wall (33) of above-mentioned ogive (25) has a groove (47) in above-mentioned arcuate walls edge, and when the deformable upper and lower part (43,45) of above-mentioned ogive was expanded, above-mentioned flange (23) was placed in the above-mentioned groove (47).